Go 海峡虽已关闭,但永不消亡
在下面的代码中,我试图写入发送到Go 海峡虽已关闭,但永不消亡,go,goroutine,channels,Go,Goroutine,Channels,在下面的代码中,我试图写入发送到输入通道的所有文件,并通过操作输出通道发送相应的响应 main.go package main import( lr "github.com/fabulousduck/librarian" "fmt" ) func main() { writeOpCount := 100; operationOutcomes, inputs := make(chan lr.WriteOpResponse), make(chan lr.Write
输入
通道的所有文件,并通过操作输出
通道发送相应的响应
main.go
package main
import(
lr "github.com/fabulousduck/librarian"
"fmt"
)
func main() {
writeOpCount := 100;
operationOutcomes, inputs := make(chan lr.WriteOpResponse), make(chan lr.WriteOp)
go lr.WriteC(inputs, operationOutcomes)
for i := 0; i < writeOpCount; i++ {
inputs <- lr.WriteOp{ Dest: `../exampleFiles/createdFiles/{i}.txt`, Content: `Invoice #{i}` }
}
close(inputs)
for i := 0; i < writeOpCount; i++ {
writeResult := <-operationOutcomes
fmt.Println("Response from write operation : ", writeResult.Msg, "err ", writeResult.Err, "bytes written : ", writeResult.BytesWritten)
}
close(operationOutcomes)
}
主程序包
进口(
lr“github.com/fabuluduck/librarian”
“fmt”
)
func main(){
WriteOpount:=100;
操作输出,输入:=make(chan-lr.WriteOp响应),make(chan-lr.WriteOp)
go lr.WriteC(输入、操作输出)
对于i:=0;i 输入您只能从操作中读取输出
多达WriteCount
次,即使在writeWorker
中,每次执行最多可在该通道上写入3条消息(您的任何错误情况都不会导致函数返回,它将继续处理)。因为它是无缓冲的,并且不再被读取,在某个时候,向它写入的工作人员无法再添加消息,因此会永久锁定
此外,由于您只调用WriteC
一次,并且它不会循环,因此它只会从输入中读取和处理一条消息。如果writeopount
为>1,则当它尝试将第二条消息排队时,它将永远锁定在第一个循环中。作为注释,因为它与q无关,因为WriteC是already被称为goroutine,为什么它会启动另一个goroutine来调用writeWorker
?因为您可能希望在代码的其他部分中添加多个彼此不相关的writeC
实例。我确实注意到了这一点,并尝试在每次推送到频道后添加return
语句。然而,这确实是可行的没有解决问题。更新-发现第二个问题。非常感谢。第二个问题解决了我的问题。
import(
"os"
"fmt"
)
type WriteOp struct {
Dest, Content string
}
type WriteOpResponse struct {
Msg error
Err bool
BytesWritten int
}
func WriteC (inputChannel <-chan WriteOp, outputChannel chan<- WriteOpResponse) {
workOp := <-inputChannel
go writeWorker(workOp, outputChannel)
}
func writeWorker (job WriteOp, outGoing chan<- WriteOpResponse) {
file, err := os.OpenFile(job.Dest, os.O_RDWR, 0666)
if err != nil {
fmt.Println("err : ", err)
outGoing <- WriteOpResponse{ Msg: err, Err: true, BytesWritten: 0 }
}
bytesWritten , err := file.WriteString(job.Content)
if err != nil {
outGoing <- WriteOpResponse{ Msg: err, Err: true, BytesWritten: 0 }
}
outGoing <- WriteOpResponse{ Msg: nil, Err: false, BytesWritten: bytesWritten }
}